This has xl97 in the subject, but maybe it applies:
http://support.microsoft.com/default.aspx?scid=kb;en-us;196620
XL97: "Cannot Empty the Clipboard" Error Message When Dragging Cells
> I always get a "Cannot empty the clipboard" pop up warning when doing a
> drag'n'drop in Excel. This version is part of Office 2003. This never used to
> happen in Office 2000. I have not been able to fine a place to turn this off.

Signature
Dave Peterson
ec35720@msn.com
Dave Peterson - 28 Sep 2004 23:06 GMT
And I just saw this in a reply to a different poster:
http://support.microsoft.com/default.aspx?scid=kb;en-us;840872
You may not be able to paste an item in an Office 2003 program after
you connect to a Windows Server 2003-based server that is running
Terminal Server
> This has xl97 in the subject, but maybe it applies:
>
[quoted text clipped - 9 lines]
> Dave Peterson
> ec35720@msn.com

Signature
Dave Peterson
ec35720@msn.com